(picture of a dollar sign and stethoscope) 
Costs associated with inpatient stays constitute the largest single component of health care spending. Healthcare Cost and Utilization Project (HCUP) data show hospital costs by payer for the five most expensive inpatient conditions. 

Total hospital costs in 2011 by condition and cost per payer (in billions): 

Septicemia (picture of a doughnut chart) with a total value in its center of $20.3 billion, divided as follows:
 Medicare: 62% ($12.7 billion), Medicaid: 13% ($2.7 billion), Private Insurance: 18% ($3.7 billion), Uninsured: 4% (less than $1.0 billion)

Osteoarthritis (picture of a doughnut chart) with a total value in its center of $14.8 billion, divided as follows:
Medicare: 54% ($8.0 billion), Medicaid: 3% (less than $1.0 billion), Private Insurance: 39% ($5.7 billion), Uninsured: Less than 1% (less than $1.0 billion)

Complication of device, implant or graft (picture of a doughnut chart) with a total value in its center of $12.9 billion, divided as follows:
 Medicare: 58% ($7.5 billion), Medicaid: 11% ($1.4 billion), Private Insurance: 25% ($3.2 billion), Uninsured: 2% (less than $1.0 billion)

Liveborn (newborn) - (picture of a doughnut chart) with a total value in its center of $12.4 billion, divided as follows:
Medicare: Less than 1% (less than $1.0 billion), Medicaid: 48% ($5.9 billion), Private Insurance: 47% ($5.8 billion), Uninsured: 2% (less than $1.0 billion)

Acute Myocardial Infarction (picture of a doughnut chart) with a total value in its center of $11.5 billion, divided as follows:
Medicare: 55% ($6.3 billion), Medicaid: 7% (less than $1.0 billion), Private Insurance: 28% ($3.2 billion), Uninsured: 7% (less than $1.0 billion)

Sources: HCUP Statistical Brief #160 (http://www.hcup-us.ahrq.gov/reports/statbriefs/statbriefs.jsp) and HCUPnet (http://hcupnet.ahrq.gov). 
(Logos of HCUP, Department of Health and Human Services and Agency for Healthcare Research and Quality)